Let the hive mind of Engadget get that for you.
"I finally got a new laptop with a lone USB 3.0 port. I'm now looking at getting a USB 3.0 hub with a power adapter so I can use both of my USB 3.0 hard drives at faster speeds. I've read lots of horror stories where some hubs either don't come with power adapters -- and as a consequence the portable drives don't work with them properly -- or they are designed poorly which results in USB 2.0 speeds. Or, the hard drives keep getting disconnected. Do your readers have any suggestions or experience using USB 3.0 hubs? Thanks!"
Correction:
So. does that mean that it cant be used if it the USB device isnt plugged into the computer??
OR does it mean that if it isnt plugged into the computer the child can still use it and the parent cant control what/who the child talks to?
What if the girl isnt in range of the device, can she still use it?